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annotate examples/example-cursor/example-cursor.c @ 508:7f7602bae0bd

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examples: minor touches
author David Demelier <markand@malikania.fr>
date Fri, 03 Mar 2023 19:45:00 +0100
parents 41267f6e344d
children f45a023f6690
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1 /*
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2 * example-cursor.c -- example on how to change cursor
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3 *
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4 * Copyright (c) 2020-2023 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <stdio.h>
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20
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21 #include <mlk/core/core.h>
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22 #include <mlk/core/err.h>
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23 #include <mlk/core/event.h>
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24 #include <mlk/core/game.h>
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25 #include <mlk/core/key.h>
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26 #include <mlk/core/painter.h>
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27 #include <mlk/core/panic.h>
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28 #include <mlk/core/state.h>
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29 #include <mlk/core/sys.h>
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30 #include <mlk/core/util.h>
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31 #include <mlk/core/window.h>
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32
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33 #include <mlk/ui/label.h>
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34 #include <mlk/ui/ui.h>
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35
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36 #include <mlk/example/example.h>
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37
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38 static struct mlk_state *states[1];
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39 static char help_text[128];
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40 static enum mlk_window_cursor cursor = MLK_WINDOW_CURSOR_ARROW;
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41
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42 static struct mlk_label help = {
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43 .x = 10,
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44 .y = 10,
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45 .text = help_text
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46 };
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47
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48 static void
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49 init(void)
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50 {
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51 int err;
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52
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53 if ((err = mlk_example_init("example-cursor")) < 0)
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54 mlk_panicf("mlk_example_init: %s", mlk_err_string(err));
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55 }
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56
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57 static void
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58 change(enum mlk_window_cursor cursor)
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59 {
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60 static const char *names[] = {
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61 [MLK_WINDOW_CURSOR_ARROW] = "MLK_WINDOW_CURSOR_ARROW",
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62 [MLK_WINDOW_CURSOR_EDIT] = "MLK_WINDOW_CURSOR_EDIT",
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63 [MLK_WINDOW_CURSOR_WAIT] = "MLK_WINDOW_CURSOR_WAIT",
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64 [MLK_WINDOW_CURSOR_CROSSHAIR] = "MLK_WINDOW_CURSOR_CROSSHAIR",
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65 [MLK_WINDOW_CURSOR_SIZE] = "MLK_WINDOW_CURSOR_SIZE",
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66 [MLK_WINDOW_CURSOR_NO] = "MLK_WINDOW_CURSOR_NO",
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67 [MLK_WINDOW_CURSOR_HAND] = "MLK_WINDOW_CURSOR_HAND"
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68 };
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69
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70 snprintf(help_text, sizeof (help_text), "Keys: <Left>/<Right> to change cursor. Current: %s", names[cursor]);
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71 mlk_window_set_cursor(cursor);
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72 }
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74 static void
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75 handle(struct mlk_state *st, const union mlk_event *ev)
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76 {
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77 (void)st;
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78
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79 switch (ev->type) {
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80 case MLK_EVENT_KEYDOWN:
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81 switch (ev->key.key) {
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82 case MLK_KEY_LEFT:
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83 if (cursor > 0)
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84 change(--cursor);
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85 break;
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86 case MLK_KEY_RIGHT:
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87 if (cursor + 1 < MLK_WINDOW_CURSOR_LAST)
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88 change(++cursor);
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89 break;
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90 default:
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91 break;
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92 }
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93
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94 break;
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95 case MLK_EVENT_QUIT:
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96 mlk_game_quit();
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97 break;
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98 default:
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99 break;
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100 }
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101 }
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102
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103 static void
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104 draw(struct mlk_state *st)
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105 {
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106 (void)st;
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107
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108 mlk_painter_set_color(MLK_EXAMPLE_BG);
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109 mlk_painter_clear();
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110 mlk_label_draw(&help);
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111 mlk_painter_present();
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112 }
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113
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114 static void
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115 run(void)
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116 {
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117 struct mlk_state state = {
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118 .handle = handle,
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119 .draw = draw
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120 };
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121
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122 change(cursor);
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123
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124 mlk_game_init(states, MLK_UTIL_SIZE(states));
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125 mlk_game_push(&state);
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126 mlk_game_loop();
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127 }
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128
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129 static void
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130 quit(void)
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131 {
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132 mlk_example_finish();
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133 }
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134
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135 int
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136 main(int argc, char **argv)
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137 {
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138 (void)argc;
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139 (void)argv;
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140
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141 init();
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142 run();
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143 quit();
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144 }